Heroes 6 - Discussion

Here's a question: the Epilogue includes two maps – are these mutually exclusive scenarios, or do they complement each other?

By the way, I started playing through the game again as Sandor, i.e., with the Orcs, but the pet doesn't fly next to him. And I would like it to.
But I forgot again about the feature of choosing the hero's class – warrior or mage. Or rather, I forgot how to do it.